Table 6: Validation of the three variable correlation radio refractivity model for osogbo under different statistical tests.

Models	R2	MBE	RMSE	MPE	NSE	IA
Eqn.18a	100.0	1.1635	1.1940	-0.3238	99.9988	99.9997
Eqn.18b	98.8	1.9757	2.3946	-0.5515	99.9951	99.9988
Eqn.18c	57.1	-8.7751	11.9299	2.3927	99.8795	99.9691
Eqn.18d	100.0	-0.2913	0.3869	0.0811	99.9999	100.00